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D. P. CLARK.

DIE FOR BENDLNG EYES FOR ELLIPTICAL SPRINGS. No. 285,231 Patented Sept.18, 1883..

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DALLAS P. CLARK, OF JERSEY CITY, NEW JERSEY, ASSIGNOR OF ONE-HALF TORIGHARD VOSE, OF NEW YORK, N. Y.

DIE FOR BENDING EYES FO R ELLIPTICAL SPR INGS.

SPECIFICATION forming part of Letters Patent No. 285,231,dated'september 18, 1883. Application filed February 16, 1883. (Nomodel.)

To all whom it may concern.-

Be it known that I, DALLAS P. CLARK, of Jersey City, in the State of NewJersey, have invented an Improved Die for Use in Manufacture of Eyes forElliptic Springs, of which the following is a specification, referencebeing had to the following drawings.

Figurel is a side elevation of my improved dies for forming the jointsof elliptic springs. Fig. 2 represents the same when closed, havingformed the first bend or operation on male leaf of said springs. Fig. 3represents the I dies for the second operation in forming the ends ofsaid male leaf, and Fig. 4 represents the same dies when closed andhaving com pleted the end of male leaf. Fig. 5 represents the dies forthe second or last operation in forming the'ends of femaleleaves of saidelliptic springs. Fig. 6 represents a section of one of the joints ofsprings formed on my dies.

The object of my invention is to form the joints of elliptic springsuniformly, rapidly, and without the use of a mandrel over which to formthem, as has been done heretofore. I also form the ends complete at asingle heat of the iron by mechanical power by means of a press providedwith sets of my improved dies,

in place of physical force in forming them by hand, as done heretofore.

The practical operation and utility of my improvements will be morefully comprehended by reference to the drawings forming part of thisspecification, in which like letters indicate like parts.

A power-press is provided with two sets of dies, Figs. 1 and 3. The diesA and B are placed in the top or movable head and the dies 0' and D inthe lower and stationary bed of the power-press the two sets beingplaced side by side, with small space between them.

A piece of steel, 6, being prepared to have the ends for joints ofsprings formed, is placed between the open dies, as seen in Fig. 1, and

when the dies have been closed the steel 6 is bent to the shape shown inFig. 2. At the return-stroke and opening of the diesthe steel 6 isplaced in the second set of dies, as seen in Fig. 3, which dies, whenclosed, produce the shape and completion of one end of male leaf ofspring, as shown in Fig. 4. eration is repeated on the opposite end andeach successive male leaf of springs until such number as may be desiredat a time has been formed. The first set of dies is then removed and asecond set in like manner placed in the press for forming the femaleleaf of said elliptic springs. The dies performing the first operationare similar in shape to those in Fig. 1, with the exception of thecurved parts he inglarger, so as to form the shape to the steel S shownin Fig 5. On the return-stroke, and upon the opening of the dies, thesteel S is placed between the dies E and F, as shown in Fig. 5. The saiddies being closed, the end t of steel S comes in contact with the notchr on the die E, an opening from r to (I being left in the circle, so asto admit of the end of The same opg the male leaf being placed inside,as shown in Fig. 6, in which. the male and female leaves are placedtogether, in the usual manner.

Having described my invention, what I claim as novel, and wish to secureby Letters Patent of the United States, is

1. The dies A and C, so shaped as to form the first bend on the steel e,as shown in Fig. 2, in combination with the dies B and D, for perfectingsaid eye, constructed as described, and for the purpose specified.

2. The die E, with its notch 'r, in combination with the dies F and Aand O, constructed as described, and for purposes specified.

DALLAS I. CLARK.

